Flying object with flashing lights , traveling at great speed, observed flying NW and returning to point of origin.

One flying object observed 02/01/2012 @ 19:00 PST.

Description: Two steady lights, two flashing lights, each at equidistant perpendicular distances from the center of the line connecting the two steady lights. Left thick trail of fumes behind it (possibly a military jet? Not ruling out possibility) Altitude: Seemed substantially higher than jets (two planes flew by a few moments later, at a more normal altitude, which added to the mystery of the observed object) Flight path: Headed NW, then changed direction abruptly to N. At 19:13, we observed it travel back to the direction it came from (SE).

Speed: Surprisingly fast for a plane, which is what initially captured our interest. Traveled the entire horizon of our view in under a minute. Travelling "back" it seemed to be going a bit slower, did not change direction.